Near-infrared polarization invisible anti-fake element identification system

An anti-counterfeit element, near-infrared technology, applied in the field of anti-counterfeit element identification system, achieves the effect of compact structure, simple operation, saving manpower and financial resources

CN104075998AInactive Publication Date: 2014-10-01NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-10-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a near-infrared polarization invisible anti-fake element identification system which integrates an infrared light source, a polarization sheet, a CCD (Charge Coupled Device) camera and a stepper motor into one system, so as to achieve optical, mechanical and electronic integration. The infrared light source adopts a square indirect lighting mode, infrared ray passes through a diffusion plate to be subjected to scattering to form a bidirectional highly-uniform circular symmetric light field, interference caused by slight different of the surface of an article can be filtered, the rapid gradient change characteristic can be revealed, and due to adoption of the infrared sensitive camera, light of a near-infrared waveband can be effectively identified; the rotation of a polarization rotating disc and the imaging of the camera are synchronized. After the initialization is accomplished, the detection on invisible anti-fake elements can be achieved through only one-key operation, so that the operation is very easy and rapid, the whole system has the advantages of compact structure, small size, rapidness and the like, and the system further has the functions of image filtering, confusion, storage and the like, so that the purposes that the operation is stable and reliable and labor and cost are saved are achieved.
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Description

technical field

[0001] The invention belongs to an identification system for anti-counterfeit components, in particular to a near-infrared polarization invisible anti-counterfeit component identification system. Background technique

[0002] In order to protect articles such as valuable documents and paper, as well as spare parts in the consumer goods sector, pharmaceuticals, textiles or other registered trademarks against imitation and counterfeiting and manipulation, and to be able to detect the authenticity of these articles, they are equipped with specific security elements . The manufacture of anti-counterfeiting elements requires some special substances and pigments, which are not easy to be imitated due to their specific optical properties. Known security elements are watermarks, security threads incorporated in paper, luminescent or magnetic particles, etc., which can be incorporated into printed inks or embossed holograms and then applied as foil elements to the su...

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Embodiment Construction

[0039] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0040]The technical solution of the embodiment of the present invention mainly includes an infrared diffuse light source module, a polarizer wheel and its control module, a near-infrared sensitive camera image acquisition module, an image processing module and other components.

[0041] The near-infrared diffuse light source is composed of a group of square structure aluminum alloy shell 1, heat sink 2, near-infrared light source 3 and diffusion plate 4, using 850nm near-infrared LED 3 as the near-infrared light source, and placing a diffuser plate in front of the near-infrared light source 3 4, such as image 3 with Figure 4 shown. After the light overlaps in the target area, the coverage area is not less than 210×210mm 2 , used to achieve uniform light irradiation on the anti-counterfeiting element to be tested.

[0042] The polarizer wheel and its control...